Containment thermodynamic conditions of oxygen/nitrogen/hydrogen/carbon
monoxide/carbon dioxide/steam/liquid water mixtures are determined by using modularized
equation-of-state subroutines, tabulated water properties, and polynomial temperature fits for
noncondensible gas properties. The numerics in the code are completely explicit, except for the
predictor-corrector technique used to estimate the heat structure effects on compartment
conditions, an implicit calculation of junction flow with inertia, and an optional implicit routine
for junction flow calculation approaching pressure equilibrium.